Airbag for seat belt

Abstract

An embodiment airbag for a seat belt includes an airbag cushion deployable from the seat belt, a first support having a shape that widens toward a space in front of a passenger at a lower portion of the airbag cushion when the airbag cushion is in a deployed state, wherein the first support is configured to be supported by thighs of the passenger, and a second support having a shape that widens toward the passenger at an upper portion of the airbag cushion when the airbag cushion is in the deployed state, wherein the second support is configured to support a head of the passenger.

What is claimed is: 
     
       1. An airbag for a seat belt, the airbag comprising:
 an airbag cushion deployable from the seat belt; 
 a first support having a shape that widens toward a space in front of a passenger at a lower portion of the airbag cushion when the airbag cushion is in a deployed state, wherein the first support is configured to be supported by thighs of the passenger; and 
 a second support having a shape that widens toward the passenger at an upper portion of the airbag cushion when the airbag cushion is in the deployed state, wherein the second support is configured to support a head of the passenger; 
 a gas inlet provided at an end of the airbag cushion; and 
 a diffuser connected to the gas inlet and an inflator while being located therebetween, wherein the diffuser has a shape in which a sectional area of a passage widens from the inflator toward the gas inlet. 
 
     
     
       2. The airbag of  claim 1 , wherein the first support is disposed such that a lower surface of the airbag cushion transversely widens from the passenger toward the space in front of the passenger. 
     
     
       3. The airbag of  claim 1 , wherein the second support is disposed such that an upper surface of the airbag cushion transversely widens from the space in front of the passenger toward the passenger. 
     
     
       4. The airbag of  claim 1 , further comprising a tether located between and connected to opposite inner surfaces of the airbag cushion. 
     
     
       5. The airbag of  claim 4 , wherein the tether is further connected to a front surface or an upper surface of the airbag cushion. 
     
     
       6. The airbag of  claim 1 , wherein:
 a front surface region of the airbag cushion has a shape that transversely widens from an upper front end of the airbag cushion toward a lower front end of the airbag cushion when the airbag cushion is in the deployed state; and 
 a tether is connected to lateral surface regions respectively connected to opposite lateral portions of the front surface region while being located therebetween; and 
 the tether is connected to the lateral surface regions to lean toward a transversely narrowed portion of the front surface region. 
 
     
     
       7. The airbag of  claim 1 , wherein:
 a rear surface region of the airbag cushion has a shape that transversely widens from a lower rear end of the airbag cushion toward an upper rear end of the airbag cushion; 
 a tether is connected to lateral surface regions respectively connected to opposite lateral portions of the rear surface region while being located therebetween; and 
 the tether is connected to the lateral surface regions to lean toward a transversely narrowed portion of the rear surface region. 
 
     
     
       8. The airbag of  claim 1 , wherein the airbag cushion comprises:
 a first panel comprising a first region having a shape that transversely widens from a first end toward a second end thereof, second regions foldable at opposite sides of the first region, and a third region foldable at the second end of the first region; and 
 a second panel comprising a fourth region having a shape that transversely narrows from a first end to a second end thereof, fifth regions foldable at opposite sides of the fourth region, and a sixth region foldable at the first end of the fourth region; and 
 wherein an edge of the first panel and an edge of the second panel are connected to each other to define the airbag cushion. 
 
     
     
       9. The airbag of  claim 1 , further comprising an external tether connected to a webbing of the seat belt where the airbag cushion is deployed and the airbag cushion while being located therebetween. 
     
     
       10. The airbag of  claim 1 , further comprising:
 a hose unit configured to supply gas supplied from an inflator to the airbag cushion; and 
 a webbing fixing part formed by protruding on an outer surface of the hose unit and fixed in a shape that wraps a webbing of the seat belt. 
 
     
     
       11. An airbag for a seat belt, the airbag comprising:
 an airbag cushion deployable from the seat belt; 
 a first support having a shape that widens toward a space in front of a passenger at a lower portion of the airbag cushion when the airbag cushion is in a deployed state, wherein the first support is configured to be supported by thighs of the passenger; 
 a second support having a shape that widens toward the passenger at an upper portion of the airbag cushion when the airbag cushion is in the deployed state, wherein the second support is configured to support a head of the passenger; 
 an inner hose through which gas supplied from an inflator passes and is supplied into the airbag cushion, the inner hose comprising a material with airtightness; and 
 an outer hose having a shape wrapping the inner hose and comprising a material with higher strength than the inner hose. 
 
     
     
       12. The airbag of  claim 11 , wherein a circumference of the inner hose is longer than a circumference of the outer hose. 
     
     
       13. The airbag of  claim 11 , wherein:
 the inflator and the inner hose are fastened to each other by a first fastener; 
 the outer hose is longer toward the inflator than the inner hose; and 
 the inflator and the outer hose are fastened to each other by a second fastener. 
 
     
     
       14. The airbag of  claim 11 , wherein:
 a hose fixing part is provided by partially extending an end of the outer hose in a longitudinal direction of the outer hose; and 
 the hose fixing part is connected to the airbag cushion. 
 
     
     
       15. The airbag of  claim 14 , wherein the hose fixing part and the airbag cushion are connected to each other by a connector. 
     
     
       16. The airbag of  claim 14 , wherein the hose fixing part is directly connected to the airbag cushion. 
     
     
       17. An airbag for a seat belt, the airbag comprising:
 an airbag cushion deployable from the seat belt, wherein the airbag cushion comprises:
 a first panel comprising first lateral surface regions foldable at opposite sides of a front surface region of the airbag cushion and a lower surface region foldable at a lower end of the front surface region; and 
 a second panel comprising second lateral surface regions foldable at opposite sides of a rear surface region of the airbag cushion and an upper surface region foldable at an upper end of the rear surface region, wherein an edge of the first panel and an edge of the second panel are connected to each other to define the airbag cushion; 
 
 a first support having a shape that widens toward a space in front of a passenger at a lower portion of the airbag cushion when the airbag cushion is in a deployed state, wherein the first support is configured to be supported by thighs of the passenger; and 
 a second support having a shape that widens toward the passenger at an upper portion of the airbag cushion when the airbag cushion is in the deployed state, wherein the second support is configured to support a head of the passenger. 
 
     
     
       18. The airbag of  claim 17 , wherein:
 each of the first lateral surface regions has a shape that transversely narrows from an upper end toward a lower end thereof; and 
 each of the second lateral surface regions has a shape that transversely widens from an upper end toward a lower end thereof. 
 
     
     
       19. The airbag of  claim 17 , wherein:
 a first inlet region extends at an end of the lower surface region; 
 a second inlet region extends at ends of the second lateral surface regions; and 
 an edge of the first inlet region and an edge of the second inlet region are connected to each other to define a gas inlet.